Device for releasably locking the loose reeds of power looms



June 5, 1923. 1,458,036

R. DERRER .DEVICE FOR RELEASABLY LOCKING THE LOOSE REEDS OF POWER LOOMS Filed Ap il 5. 19.22 2 Sheebs-Sheet 1 June 5 1923;

R. DERRER DEVICE FOR RELEASABLY LOCKING THE LOOSE REEDS OF POWER LQOMS Filed. April 5, 1922 2 Sheets-Sheet 2 Patented uFume 5, i923.

intense warren .sraras rarest entree.

RUDOLLF DEBRER, F RUTI, SWITZERLAND, ASSIGNOR TO MIASGHINENFABRIK RfTTI FORIVIEBLY CASPAR HONEGGER, OF RUTI, ZURICH, SWITZEELAND.

DEVICE FOR BELEASABLY LOCKING Application filed April 5,

To all whom it may concern:

Be it known that I, RUDoLF DERRER, a citizen of the Republic of Switzerland, residing at Ruti, Canton of Zurich, Republic of Switzerland, have invented certain new and useful Improvements in Devices for Beleasably Locking the Loose Reeds of Power Looms, of which the following is a specification.

In power looms with a fiXable, loose reed the latter is fixed or locked, when the shuttle is in normal operation, just before the beat of the reed, for beating up the weft. On the shuttle getting stuck in the warp, the loose reed swings backwards, so that the warp threads shall not be liable to be torn by the beating up of the lay. In this case the reed will not be locked with the lay.

F or looking the loose reed a bar adapted to slide along the lay is generally used (see for instance German Patent 63172), which bar in the operative position locks a pivoted member, which presses resiliently against the lower edge of the reed, to the lay, so that, when the shuttle operates normally, the beat of the reed will take place in the. proper manner. The loose reed is released at the commencement of the forward movement of the lay, by a cam which is brought by the crank shaft and a lever within range of a bolt attached to the locking bar, whereby the latter is displaced into the inoperative position. Should a shuttle get stuck in the warp during the forward movement of the lay, when the reed is not locked, it will swing the loose reed backwards, thus preventing the warp threads from being torn. In this case there will be no locking of the reed with the lay just before the end of the forward movement of the latter.

One disadvantage of the above means for the positive displacement of the locking bar resides in the fact, that the co-action of parts, that move to and fro with the lay, and other stationary ones, that are mounted on the frame of the loom and are operated from the crank shaft independently, gives rise to trouble and makes the entire arrangement inconvenient. The friction of the stop-pin of the locking bar will cause considerable wear on the cam.

In the device according to the invention, in which for locking the reed with the lay a reciprocating locking bar and a clamping bar for the reed, which isadapted to be THE LQOSE REEDS OF POWER LOOIJIS.

1922. Serial No. 549,764.

coupled with the locking bar by at least one member passing transversely through the lay, are used, the disadvantages mentioned above are overcome, by all the parts required for operating the locking bar being mounted on the lay and the positively controlled displacement of the locking bar being derived through intermediate members from the oscillating motions of one of the pitmans imparting a swinging motion to the lay; Smooth working with very little frictional resistance and great constructional simplicity are the main advantages of the invention.

The accompanying drawing shows a constructional example of the device according to the invention.

Fig. 1 is a side elevation of the lay showing the crank shaft and the pitmans diagrammatically r Fig. 2 is a partial front elevation of the y;

"Fig. 3 is a cross-section and the locked reed;

Fig. i is a partial plan View of the lay with the reed 1n the locked position;

Fig. 5 is a cross-section through the lay through the lay with the reed released and thrown back and Fig. 6 is a partial plan view of the lay with the reed released and thrown back.

1 (Fig. 1) is the crank shaft of a power loom, in which the two pitmans 2 impart a swinging motion to the lay 4, which is supported by the lay sword 3. The front end of one of the pitmans 2 is mounted on a front pin 6, which is rotatably journalled in the adjacent lay sword 3 in bearings 5,

and on which pin a lever 7 with a hookshaped end is also mounted. This sleeveshaped end is provided with a pin '8, on which a crowned roller 8 is loosely mounted. The forked end of the horizontal arm of the bell-crank lever 9, 11, embraces the said roller. The bell cranklever 9, 11 is pivoted at 10 on the'lay and the vertical arm of this lever carries a pin upon which a roller 11 is loosely mounted. The lever 9, 11' is perpendicular to the lever 7.

on the front of the lay the usual locking bar 12 is slidably mounted. It carries a bent tappet 13 and a plate 14, which is provided with a locking projecting part 15 of semi-circular cross-section and a bearing 16 for a sliding pin 17 with a head 18. Between the head 18 and the bearing 16 a compression spring 19 is mounted on the pin 17, which spring seeks to force the locking bar 12 to the left and the head 18 of against the roller 11".

The reed 21 is mounted so as to swing in the hand rail 20. Theswinging clamping bar 22 presses the reed '21 by means of a spring, which is not shown, resiliently against the lay 1. and is provided over its entire length with a number of locking bolts 23, which pass through transverse holes in the lay. 4. and of which only one is shown in the drawing. Each bolt 23 is provided with a nut 24 having an integral flange 25 and with a lock nut 26 and is pivoted to the clamping bar 22.

The operation of the above described apparatus is as follows When, after the shuttle has run right into the shuttle box, the pitmans 2 swing the lay forward, one of the said pitmans moves 'theleyers 7 andf9, 11 in such a manner that the roller 11 of the upright arm 11 forces the pin17; to the right (Figs, 2 and 1), and that the spring 19, is compressed and the locking bar 12 is pushed to the right. Dhe semicylindrical projecting piece 15 passes behind the flange 25 of the nut 24 (Figs. 2, 3 and 4E), causing the reed 21 tobe locked to thelay and made ready for beatingup. Onthelay moving backward, the levers 7 and 9, 11 are moved in the opposite direction byv the corresponding pit1nan-2 and the roller 11 of the arm 11 of the bell-cranklever, will press against the bent tappet 13, by which 'means Should a. shuttle 27 (Fig. 5) get stuck in the, warp, itwill, when the lay 4 moves forward, ,press hack. the reed 2,1 and thereed willpress back the reed clampingbar, 22

with the bolts 23 (Figs. 5 and 6)kso,thatthe projecting piece 15 will not pass behind the, flange 25 of thenut 24c and thus the reed cannot be locked. When the lever 9,

11 isnow moved in the clockwise direction the spring 19 iscmnpressed without imparting-movement to the locking bar 12 (Fig. 6 The roller 11 is now. moved from the tappet 13. As, soon as the reed when pushed back by the-shuttle releases the reed clampingibar 22, the-latter will again swing forward into its starting.- position without looking taking place, however.

Owing to; the rolling movement of the lever? on the lever 9, 11 and that of the roller 11 onthe head-18 of the pin and the bent tappet 13 the friction and wear is very small; The construction of the entire loose reed arrangementis exceedingly simple and is th refore never likely to get out of order;

The locking motion of the locking bar can be effected by a tension spring, instead of by a compression spring.

What I claim is:

1. In a power loom, in combination, a lay, means for oscillating the laydncluding a plurality of pitmans, a loosereed capable of being locked, a reciprocating bar on the lay, a pivotally mounted bar for clamping the loose reed to the lay, bolts carried by the clamping bar and passing transversely through the lay for coupling the clamping bar to the lay, means carried by the reciprocating bar and cooperating withthe bolts to secure the same in the coupling position, a spring acting upon the reciprocating bar and the said securing means, and means between the said spring and one of the pitmans to reciprocate the bar in opposite d1- rections, substantially as, and for the purposes set forth.

2. In a power loom, in combination, a lay, means for oscillating the lay including a plurality of pitmans, a loose reed capable of being locked,a reciprocating bar on the lay, a pivotally mounted bar for clamping the. loose reed to the lay, bolts carried by the clamping bar and passing transversely through the lay for coupling the, clampingbar tothe lay, means carried by the reciprocating bar and cooperating with the bolts tosecure the same in, the coupling position, spring acting uponthe reciprocating bar and.

the said securing meansan-d a pair of levers;

arranged in crossed relation. between thesaid spring and one of the pitmans and capable of rolling on each other to reciprocate'the bar in opposite directions substan tially as and for the purposes set forth,

3. In a power loom, in combinatioma lay, pitmans for swinging the lay, a loose reed capable of being looked, a reciprocating. locking baron the lay, a clamping; bar for clamping the loose reed to the lay, bo-lts carried by the clamping bar passing trans verselyf through the lay for coupling the clamping bar to the lay, nuts on.the,.bo1ts,, projections extending from the lockinglbar andengageable at times behind the nuts, a

bell crank leverpivoted to the lay to reciprocate the locking'bar, aspring exerting areisllient pressure on the bell-crank lever linone bell-crank lever pivoted to the lay to reciprocate the locking bar, a roller mounted on one arm of the lever to act upon the locking bar and the other arm being bifurcated at the outer end thereof, a spring exerting a resilient pressure on said roller upon the locking bar in one direction, another lever operably connected to one of said pitmans and having a hook-shaped outer end, a roller mounted in the hook-shaped lever and engaged by the bifurcated arm of the bell-crank lever, and both of said levers being substantially perpendicular one to the other and capable of rolling on each other, substantially as and for the purposes set forth.

5. In a power loom, in combination, a lay, pitmans for oscillating the lay, a loose reed capable of being looked, a reciprocating locking bar on the lay, a clamping bar for clamping the loose reed to the lay, bolts carried by the clamping bar and assing transversely through the lay for coup ing the clamping bar to the lay, nuts on said bolts, projections extending from the locking bar and engageable behind nuts on the said bolts, a bell-crank lever pivoted to the lay to reciprocate the locking bar, a roller mounted on one arm of the lever and the other arm being bifurcated at the outer end thereof, a spring exerting a resilient pressure on the roller in one direction, a bearing carried by the locking bar, a pin slidably mounted in said bearing and having a head, the spring being arranged on the pin between the head and the bearing, the in being arranged to receive the pressure of the roller to compress the spring without moving the rocking bar in the event the said projections on the looking bar are not engaged behind the nuts, another lever operably connected to the front end of one of saidpitmans and having a hook-shaped end, another roller mounted in said hook-shaped lever and engaged by the bifurcated arm of the bell crank lever, and both of said levers being substantially perpendicular one to the other and capable of rolling on each other, substantially as and for the purposes set forth.

In testimony whereof I have aflixed my signature.

RUDOLF DERRER. 

